<template>
  <div class="star" :class="starType">
    <span v-for="itemClass in itemClasses" :class="itemClass" class="star-item"></span>
  </div>
</template>

<script type="text/ecmascript-6">
  const LENGHT = 5;
  const CLS_ON = 'on';
  const CLS_HALF = 'half';
  const CLS_OFF = 'off';

  export default {
      props: {
          size: {
              type: Number
          },
          score: {
              type: Number
          }
      },
      computed: {
//          计算属性
        starType () {
            return 'star-' + this.size;
        },
        itemClasses () {
          let resulf = [];
          let score = Math.floor(this.score * 2) / 2;
          let hasDecimal = score % 1 !== 0;
          let integer = Math.floor(score);
          for (let i = 0; i < integer; i++) {
              resulf.push(CLS_ON);
          }
          if (hasDecimal) {
              resulf.push(CLS_HALF);
          }
          while (resulf.length < LENGHT) {
            resulf.push(CLS_OFF);
          }
          return resulf;
        }
      }
  };
</script>

<style lang="stylus" rel="stylesheet/stylus">
  @import "../../common/stylus/mixin.styl"

  .star
    font-size 0
    .star-item
      display inline-block
      background-repeat no-repeat
    &.star-48
      .star-item
        width 20px
        height 20px
        margin-right 22px
        background-size 20px 20px
        &:last-child
          margin-right 0
        &.on
          bg-image('star48_on')
        &.half
          bg-image('star48_half')
        &.off
          bg-image('star48_off')
    &.star-36
      .star-item
        width 15px
        height 15px
        margin-right 6px
        background-size 15px 15px
        &:last-child
          margin-right 0
        &.on
          bg-image('star36_on')
        &.half
          bg-image('star36_half')
        &.off
          bg-image('star36_off')
    &.star-24
     .star-item
        width 10px
        height 10px
        margin-right 3px
        background-size 10px 10px
        &:last-child
          margin-right 0
        &.on
          bg-image('star24_on')
        &.half
          bg-image('star24_half')
        &.off
          bg-image('star24_off')
</style>
